A compound attribute that is the ratio of amount of interleukin-1 receptor-associated kinase 1 (human) in blood to amount of protein sprouty homolog 2 (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2055525 (IRAK1/SPRY2 protein level ratio in blood). Also known as: the ratio of amount of interleukin-1 receptor-associated kinase 1 (human) in blood to amount of protein sprouty homolog 2 (human) in blood.